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Sodium ion solid electrolyte and preparation method thereof

A solid electrolyte and sodium ion technology, applied in the field of sodium batteries, can solve the problems of high cost of all solid electrolytes, low safety of liquid electrolytes, and large interface resistance, and achieve improved economic efficiency and performance, high energy density, and low interface resistance. Effect

Inactive Publication Date: 2019-07-02
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to prepare a new type of solid electrolyte, study its performance, and apply it to sodium batteries, aiming to solve the problems of high cost and large interface resistance of all solid electrolytes in current sodium batteries and the safety of liquid electrolytes Low and extremely flammable, explosive problems provide a kind of sodium ion solid state electrolyte and its preparation method

Method used

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  • Sodium ion solid electrolyte and preparation method thereof
  • Sodium ion solid electrolyte and preparation method thereof
  • Sodium ion solid electrolyte and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] As a sodium ion solid electrolyte in an embodiment of the present invention, the sodium ion solid electrolyte includes the following components: ionic liquid, montmorillonite and sodium salt, and the sodium ion solid electrolyte is prepared and heated;

[0037] The ionic liquid is 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide salt;

[0038] The sodium salt is sodium bistrifluoromethanesulfonylimide;

[0039] The mass concentration of the sodium salt in the mixture of the ionic liquid and the sodium salt in the sodium ion solid electrolyte is 5%;

[0040] The mass ratio of the total mass of the sodium salt and the ionic liquid to the montmorillonite is 2.

[0041] A method for preparing a sodium ion solid state electrolyte of the present embodiment, the method comprising the following steps:

[0042] (1) Under normal temperature and pressure, in an argon-filled glove box (oxygen and water content less than 0.1ppm), the ionic liquid 1-ethyl-3-methylimidazole...

Embodiment 2

[0047] As a sodium ion solid electrolyte of the embodiment of the present invention, the difference between the present invention and Embodiment 1 is: the mass concentration of the sodium salt in the mixture of the ionic liquid and the sodium salt in the sodium ion solid electrolyte is 95%;

[0048] The mass ratio of the total mass of the sodium salt and the ionic liquid to the montmorillonite is 1.09.

[0049] Characterization of the sodium ion solid electrolyte of this example: use Kester’s electrochemical workstation to test performance at a room temperature of 25°C, and the frequency range is 1-10 6 Hz.

[0050] After fitting, the ionic conductivity of the solid electrolyte of this embodiment is 4.8×10-4 S / cm.

Embodiment 3

[0052] As a sodium ion solid electrolyte of the embodiment of the present invention, the difference between the present invention and Embodiment 1 is: the mass concentration of the sodium salt in the mixture of the ionic liquid and the sodium salt in the sodium ion solid electrolyte is 15%;

[0053] The mass ratio of the total mass of the sodium salt and the ionic liquid to the montmorillonite is 1.09.

[0054] The sodium ion solid electrolyte of the present embodiment is characterized, and the results are as follows figure 2 As shown, after fitting, the impedance of the solid electrolyte of this embodiment is 148Ω, and the ion conductivity is 6.7×10 -4 S / cm. figure 1 It is a scanning electron microscope image of the solid electrolyte of this embodiment, which proves that its surface is relatively dense.

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Abstract

The invention provides a sodium ion solid electrolyte comprising an ionic liquid, clay and a sodium salt. The sodium ion solid electrolyte is obtained by preparing and heating, the clay is montmorillonite or aluminum-pillared clay. The sodium ion solid electrolyte has high energy density, a room-temperature ionic conductivity of 6.7*10 4S / cm, low interface resistance between an electrode and a solid electrolyte, a high sodium ion transport speed, and high safety. The preparation method of the invention has a simple process and low cost.

Description

technical field [0001] The invention relates to the technical field of sodium batteries, in particular to a sodium ion solid electrolyte and a preparation method thereof. Background technique [0002] In recent years, the research and development of sodium-ion batteries has developed rapidly. Its main advantage is that sodium resources are abundant and widely distributed, so the price is low, and its working principle is similar to that of lithium-ion batteries. However, the ion transport medium used in commercial sodium-ion batteries is also a liquid organic electrolyte, which has problems such as low safety and easy leakage. However, although the safety of the current sodium solid electrolyte is guaranteed, the equipment requirements during preparation are high, the preparation time is long, and the interface resistance of the prepared sodium solid electrolyte is large. [0003] It can be seen that the prior art of solid electrolyte still needs to be improved and develope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/054
CPCH01M10/054H01M10/0562H01M2300/0068Y02E60/10
Inventor 贺鹤鸣毛海添
Owner GUANGZHOU UNIVERSITY
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